... these steel pipes are suitable for the industries of oil,natural gas,ship building,chemical,environmental protection,boiler,water ... for low pressure liquid delivery, such as water,gas,oil,oil drilling and machinery manufacturing,etcStandardAPI 5L, API 5CT,ASTMA53 ... Coal Tar Epoxy,3PE,FBE,Varnish coating,Bitumen coating, Black oil coating as per customer’s requirement TestChemical Component Analysis, ...